Related by context. Frequent words. (Click for all words.) 55 isotope ratios 53 Fig. 1A 53 magmas 52 igneous 51 isotopic composition 50 biogeochemical 50 aragonite 50 oceanic crust 49 abundances 49 elemental composition 49 crustal 48 spherules 48 Cenozoic 48 magmatic 48 electron density 47 abiotic 47 biogenic 47 lavas 47 Supplementary Fig 47 meteorite impacts 47 mineralizing 47 manganese oxide 47 lithosphere 47 basaltic 47 Tharsis 47 morphologies 47 silicate 46 adsorbed 46 dynamical 46 ejecta 46 hydrologic cycle 46 perturbations 46 anisotropy 46 perovskite 46 apatite 46 Anomalous 46 solar nebula 46 nonliving 45 Meridiani 45 mud volcanoes 45 planetesimals 45 continental crust 45 surficial 45 nonlinearity 45 radioactive decay 45 tropospheric 45 sorption 45 basalts 45 volcanism 45 isotopic 45 fluvial 45 planetary nebulae 45 oxygen isotopes 45 igneous rock 44 marine sediments 44 hydrothermal 44 naturally occuring 44 labile 44 Oort Cloud 44 anomalously 44 primordial 44 diatom 44 foraminifera 44 planktonic 44 hydrothermal activity 44 γ 44 macroscopic 44 deglaciation 44 stromatolites 44 depositional 44 igneous rocks 44 Valles Marineris 43 hydrothermal vent 43 anisotropic 43 upwelling 43 pyroclastic 43 GPa 43 convective 43 metamorphic rocks 43 iron oxides 43 methanogens 43 tectonics 43 carbonaceous 43 earth crust 43 geoid 43 clasts 43 nucleation 43 subduction zones 42 tectonic 42 unicellular 42 microfossils 42 z = 42 excitations 42 multicellular 42 ^ sub 42 Olympus Mons 42 Archaean 42 prokaryotes 42 Correlating 42 silicates 42 MgO